Yes,
Pioneer will combine the telephone numbers onto one convenient bill for you when you are requesting long distance services in multiple States. This can occcur even if the rate plan is different for each of the calling areas. Don't worry Pioneer will bill the calls properly from each line.
Is Pioneer available in your area? If so, here is how it will work.
Sign up under the long distance section at PhoneDog.com. Once activated, calls made from each telephone line will be billed at the rate you selected for that area code and prefix. When you receive your e-mail bill, an itemized breakdown is provided for each call made from the separate telephone numbers and the rate each call was billed at.
So when signing up for Pioneer long distance at home, don't forget to sign up your vacation retreat as well!